The boundless ocean formed by the Profound Nether Curse expanded so vast that even Gao Xuan could not control it.
With the fusion of the infinite laws from the Celestial Spirit Sword Box, the Profound Nether Curse Sea increased by 30 billion times.
To know that the original Profound Nether Curse Sea had already made the Hongyi Sword a top-tier Divine Artifact.
According to the division of the Immortal Realm, it could definitely be counted as an Immortal Artifact.
An Immortal Artifact enhanced by 30 billion powers might even surpass a Celestial Artifact.
Of course, reaching the Earth Artifact Level already means mastering a certain law. The Hongyi Sword's mere power increase cannot be considered very sophisticated.
Encountering a strong Earth Artifact might mean having power with nowhere to use it.
Most importantly, Gao Xuan has not been able to refine the Profound Nether Curse Sea. He can only control the core part of the Profound Nether Curse Sea. Even so, it's enough.
